Vulnerability · Published Sep 10, 2026 · Assigned by GitHub_M
CVE-2026-45770Suricata lua: excessive flow variable registration can bypass sandbox
High 7.5
In plain English
A high-severity out-of-bounds write in suricata from OISF. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Starting in version 8.0.0 and prior to version 8.0.5, a Lua rule that registers too many flow variables can corrupt Lua detection state and may bypass Suricata's restricted Lua sandbox. This requires an affected Lua script/rule to be loaded. Excessive flow variables being registered may also cause Suricata to crash. Version 8.0.5 contains a fix. As a workaround, disable `security.lua.allow-rules` unless Lua rules are required.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | suricata | no fix listed | DEBIAN-CVE-2026-45770 |
| Debian:14 | suricata | 1:8.0.5-1 | DEBIAN-CVE-2026-45770 |
| Ubuntu:22.04:LTS | suricata | no fix listed | UBUNTU-CVE-2026-45770 |
| Ubuntu:24.04:LTS | suricata | no fix listed | UBUNTU-CVE-2026-45770 |
| Ubuntu:26.04:LTS | suricata | no fix listed | UBUNTU-CVE-2026-45770 |
Affected products (as reported)
Weakness: CWE-693, CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References
- https://github.com/OISF/suricata/security/advisories/GHSA-653j-cc95-vj4c x_refsource_CONFIRM
- https://forum.suricata.io/t/suricata-8-0-5-and-7-0-16-released/6315 x_refsource_MISC
- https://redmine.openinfosecfoundation.org/issues/8556 x_refsource_MISC